removing debris
setting up fhog input args
reordering ... it's gradMag(), then fhog()
fleshing out args
planning to rework filenames a bit
huh, calloc not declared? but I included stdlib.h...
got Calloc to compile
convert img to CV_32FC3
hmm, doesn't want to convert uchar* to float*, even though I've clearly converted the img to 32FC3
calling piotr's gradMag(). segfault. investigating.